simple modules

[Brendan Eich]

On Feb 3, 2010, at 12:20 PM, David Herman wrote:

> Although it should perhaps not be possible to export a `let'  
> binding; those really are supposed to be purely local.

The issue arises because we do want 'const' bindings to be exportable,  
and they are supposed to be block-scoped exactly like 'let', but of  
course written only by initialization (a mandatory syntactic  
initializer) and not readable in the "temporal dead zone" before the  
initializer has been evaluated and the const's value set.

/be